Rigid Panel Greenhouse
Polyvinyl chloride rigid panels,
fibre glass-reinforced plastic, acrylic and polycarbonate rigid panels are
employed as the covering material in the Quonset type frames or ridge and
furrow type frame. This material is more resistant to breakage and the light
intensity is uniform throughout the greenhouse when compared to glass or
plastic. High grade panels have long life even up to 20 years. The main
disadvantage is that these panels tend to collect dust as well as to harbour
algae, which results in darkening of the panels and subsequent reduction in the
light transmission.